Interpet aquariums are often picked up from places like Pets At Home. This aquarium can be used for Coldwater fish and of course tropicals, but you will need to purchase a heater 200w should be suitable.
There's a easy to control high flow pump to keep a good range of water movement, filtration is all built in and is done via Sponges.
The Interpet Fish Pod Moon Aquarium comes with everything you need to get started in coldwater fish keeping.
Lighting is provided by a 15w fluorescent energy saving bulb. It will only hold 19 litres of water but this should be fine for a smaller goldfish or a few small tropical fish.
You can get the Interpet Fish Pod Moon Aquarium for around £60 online.
Interpet are usually pretty good aquariums and are better know for the River Reef series and Fish Pod X